According to this source, what caused the Great Depression of 1929 – 1939?

Question 9 options:

a)

The number of products made was higher than the number of people buying them (supply was greater than the demand) ; this made costs of things too high (inflation).

b)

The number of people buying farming products was higher than the production of them (demand was greater than the supply); farmers were selling crops and land very cheap.

c)

Inflation, World War I, the stock market and Hitler.

d)

Drought, factories were destroyed in World War I and labor unions.

a) The number of products made was higher than the number of people buying them (supply was greater than the demand) ; this made costs of things too high (inflation).